It was explained to me like this, if you are convinced you have something specific, like cancer, even after the doctors rule it out, you're a hypochondriacs. I was told I'm not a hypocondriac because I don't focus in on something and become certain I have it despite evidence. I'm not convinced and am sure I'm a hypocondriac. Therefore, I'm a hypocondriac about being a hypocondriac.